| Quality | Premium |
| Diameter | 5-10 cm |
| Length | 10-25 cm |
| Density | 0.25-0.30 g/cm3 |
| Carbon content | 76-86% |
| Humidity | 6% |
| Volatile Matter | 10-15% |
| Color | Shiny black |
| Sound | Metallic |
| Impurities | None |
| Packaging | 20kg sacks |
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